My Inquiry
My Account
Vishay General Semiconductor - Diodes Division 3KASMC28AHM3/57T
- Part No.:
- 3KASMC28AHM3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC28AHM3/57T.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,365
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
3KASMC28AHM3/57T from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) designed for high-energy surge clamping in automotive and industrial power rails. It delivers 3000 W peak pulse power (10/1000 μs), clamps at 45.4 V under 66.1 A surge current, and operates up to 185 °C junction temperature - enabling robust protection of MOSFETs and ICs against inductive switching transients in engine control units and motor drives.
For engineers reviewing the 3KASMC28AHM3/57T datasheet, 3KASMC28AHM3/57T pinout, 3KASMC28AHM3/57T application, or 3KASMC28AHM3/57T equivalent, key selection criteria include its DO-214AB (SMC) package, 28 V stand-off voltage, AEC-Q101 qualification, 1.0 mA breakdown test current, and 1.0 μA max reverse leakage at VWM.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology with optimized junction passivation for stable clamping performance across -65 °C to +185 °C. Its unidirectional polarity and low incremental surge resistance ensure fast response (<1 ns) and minimal voltage overshoot during transient events.
The device is rated for 200 A non-repetitive forward surge current (8.3 ms half-sine), supports MSL Level 1 reflow (260 °C peak), and meets JESD201 Class 2 whisker resistance - confirming suitability for automated SMT assembly in high-reliability automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below protected circuit's max rail voltage. |
| VBR (min/max) | 31.1 V / 34.4 V at 1.0 mA - Confirmed breakdown range ensures predictable turn-on threshold under standardized test conditions. |
| VC @ IPPM | 45.4 V at 66.1 A - Clamping voltage under full 3000 W surge defines worst-case overvoltage seen by downstream components. |
| PPPM | 3000 W (10/1000 μs waveform) - Peak transient energy handling capacity for lightning and load-dump immunity per ISO 7637-2. |
| TJ max. | +185 °C - Enables operation in under-hood automotive environments without derating in most PCB layouts. |
| RθJA | 77.5 °C/W - Thermal resistance from junction to ambient; informs heatsinking requirements when operating near PD = 6.0 W limit. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTGB, HTRB, and temperature cycling per stress test standard. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, cathode indicated by color band. Complies with UL 94 V-0 flammability rating and J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or low-side reference; enables clamping action when cathode is tied to protected line. |
| Cathode | Current exit point during forward conduction; marked by band | Connected to protected signal/power line; reverse-biased during normal operation, avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Passivated anisotropic rectifier technology | Enables stable VBR and low leakage (<1.0 μA) across temperature and lifetime, critical for long-term automotive deployment. |
| 185 °C junction rating | Eliminates need for thermal derating in high-ambient environments such as powertrain ECUs and industrial motor controllers. |
| 3000 W peak pulse power (10/1000 μs) | Meets ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 surge immunity requirements for 12 V systems. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow without moisture-related failure, compatible with standard SMT lines. |
| AEC-Q101 qualification | Validates reliability for automotive applications including HTGB, HTRB, and accelerated life testing per JEDEC standards. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Power Stage |
|---|---|
Use Scenario: Protecting MCU I/O and gate drivers from load-dump transients during alternator regulation faults. IC Role / Device Role: Unidirectional TVS placed between 12 V supply rail and ground to clamp surges up to 3000 W. Use Value: Limits rail voltage to ≤45.4 V during 66.1 A surge, preventing latch-up or permanent damage to 3.3 V/5 V logic and MOSFET gate oxides. |
Use Scenario: Safeguarding IGBT gate drivers and current-sense amplifiers from inductive kickback during PWM switching. IC Role / Device Role: TVS mounted across DC bus or gate resistor to suppress dv/dt-induced spikes on sensitive analog inputs. Use Value: Fast response (<1 ns) and low clamping voltage preserve signal integrity and prevent false triggering in isolated feedback paths. |
| Telecom Power Supply Input | Consumer Appliance Main Board |
Use Scenario: Suppressing lightning-induced surges on AC/DC front-end inputs of base station power supplies. IC Role / Device Role: Primary-level TVS on bulk capacitor input to absorb differential-mode transients per IEC 61000-4-5 Level 4. Use Value: 3000 W rating and 45.4 V clamping enable compliance with telecom surge immunity standards without cascaded protection stages. |
Use Scenario: Protecting microcontroller reset lines and communication interfaces (UART, I²C) from ESD and relay bounce in washing machine control boards. IC Role / Device Role: Low-leakage (1.0 μA) unidirectional TVS on 3.3 V supply rail feeding sensor interface circuits. Use Value: Ensures <1 μA standby current draw while maintaining 31.1–34.4 V breakdown tolerance for reliable reset assertion during brownout recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A | Lower PPPM (400 W), same DO-214AC (SMA) package, VC = 45.7 V at 8.3 A | Not suitable for ISO 7637-2 load dump; limited to lower-energy ESD and EFT events | Select only for cost-sensitive consumer applications where 3000 W surge immunity is not required. |
| SMCJ28A | Same DO-214AB (SMC) package, identical VWM/VBR/VC, but rated for 3000 W and AEC-Q101 qualified | Functionally interchangeable; differs only in manufacturer-specific process and screening documentation | Valid alternative if dual-sourcing is needed; verify lot traceability and qualification reports match OEM requirements. |
Compared with SMAJ28A and SMCJ28A, the 3KASMC28AHM3/57T provides identical clamping performance and automotive qualification in the same SMC package, but offers higher thermal stability (185 °C vs. 150 °C typical) and tighter VBR tolerance - making it preferred for under-hood deployments requiring extended temperature margin.
Availability
3KASMC28AHM3/57T is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, and telecom power supplies requiring stable component supply with AEC-Q101 assurance and high-temperature reliability.
Supply support for 3KASMC28AHM3/57T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The 3KASMC series is engineered specifically for high-energy transient suppression in harsh-environment automotive and industrial systems, emphasizing AEC-Q101 qualification, 185 °C operation, and robust surge handling in compact SMC packages.
FAQ
What is the maximum clamping voltage of the 3KASMC28AHM3/57T under full-rated surge current?
The 3KASMC28AHM3/57T clamps at 45.4 V when subjected to its peak pulse current of 66.1 A (10/1000 μs waveform). This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case transients. The 3KASMC28AHM3/57T maintains this clamping performance across its full operating temperature range.
Is the 3KASMC28AHM3/57T suitable for automotive under-hood applications?
Yes - the 3KASMC28AHM3/57T is AEC-Q101 qualified and rated for a maximum junction temperature of +185 °C, making it suitable for under-hood automotive applications such as engine control units and transmission control modules. Its DO-214AB (SMC) package and MSL Level 1 rating further support reliable reflow assembly in automotive production environments.
What does the "HM3/57T" suffix indicate in 3KASMC28AHM3/57T?
The "HM3" suffix denotes RoHS-compliant, AEC-Q101-qualified construction with matte tin-plated leads meeting J-STD-002 and JESD22-B102 solderability standards. The "57T" indicates packaging in 7-inch diameter plastic tape and reel, with a base quantity of 850 units - a standard logistics configuration for automated SMT placement.
How does the 3KASMC28AHM3/57T compare to standard SMA-package TVS diodes in surge capability?
The 3KASMC28AHM3/57T delivers 3000 W peak pulse power in the larger DO-214AB (SMC) package, whereas SMA-package equivalents like SMAJ28A are typically rated for only 400 W. This 7.5× higher energy handling enables the 3KASMC28AHM3/57T to meet ISO 7637-2 load-dump requirements that SMA devices cannot satisfy.
Does the 3KASMC28AHM3/57T have bidirectional polarity?
No - the 3KASMC28AHM3/57T is unidirectional only, with cathode identified by a color band. It conducts in forward bias and clamps reverse transients above its breakdown voltage. Bidirectional variants are not offered in the 3KASMCxxA family; design requires correct orientation relative to the protected rail's reference potential.
3KASMC28AHM3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 66.1A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
3KASMC28AHM3/57T FAQ
1.How can I place an order for 3KASMC28AHM3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC28AHM3/57T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 3KASMC28AHM3/57T reliable?
The price and inventory of 3KASMC28AHM3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC28AHM3/57T is usually 5 days.
3.What payment methods are accepted for 3KASMC28AHM3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC28AHM3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC28AHM3/57T?
3KASMC28AHM3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC28AHM3/57T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 3KASMC28AHM3/57T?
For technical support, including 3KASMC28AHM3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC28AHM3/57T requirements.
6.How does Aetrix verify that 3KASMC28AHM3/57T is sourced from the original manufacturer or authorized distributors?
All 3KASMC28AHM3/57T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 3KASMC28AHM3/57T meets industry standards.
7.What is the process for return or replacement of 3KASMC28AHM3/57T?
All 3KASMC28AHM3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC28AHM3/57T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 3KASMC28AHM3/57T part is unused and in its original packaging.
Return procedure for 3KASMC28AHM3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC28AHM3/57T Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
